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@jamie remember someone trying to sell this to me as a good idea in school. It's fine, but it being 12s... I couldn't really use it quickly.

I tweaked it to base 10.
Thumb stays as 1, thumb-to-fingertips 2-5, thumb-to-middle knuckle 6-9

@jamie
have you been taking your socks off this whole time. ;)

it did the rounds in my school at the same time as this archimedes-lab.org/Maths2_Mult

@basil Interesting. Thanks for the link. Youngest is doing times tables now. Will see if that helps.

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